Method for controlling greenhouse vegetable aphids through adoption of harmonia axyridis

The invention discloses a method for controlling greenhouse vegetable aphids through the adoption of harmonia axyridis. A plastic flower pot, a cultivation medium, tobacco seedlings and an insect proof net are selected to form an integrated device, so that the expanding propagation and recycling of harmonia axyridis are realized, and the control of greenhouse vegetable aphids is realized by adopting the harmonia axyridis. According to the method, a harmonia axyridis population with a big enough group size, suitable for production, is established by performing expanding propagation on a small group of harmonia axyridis, and after being released, harmonia axyridis in the harmonia axyridis population has strong adaptive capacity to field conditions, and are high in predation rate to aphids, so that the population density of aphids is effectively reduced, and the control efficiency can reach 85% or above.